简约手绘风自然主义明亮向日葵与绿草清新生机插画

illustration, two sunflowers and a grassy field, main colors yellow and green, bright and natural color scheme, larger sunflower on the right, smaller sunflower on the left, both facing forward, green grass below with simple leaf shapes, detailed petal textures and grass blades, transparent background, fresh and natural visual effect, conveying cheerful and vibrant emotions